<div class="left_box">
            <div class="contact_us">
                <span><img src="<?php echo base_url() ?>images/user_icon.jpg" /></span>
                <p>欢迎<?php echo $this->session->userdata("user");?>用户</p>
                <a href="/index.php/login/loginout">退出</a>
            </div>
            <div class="side_nav">
                <?php echo $menu ?>
            </div>
      </div>